Filter



Aug. 26, 1941. w. P. DALRYMPLE FILTER Original Filed Nov. 3, 1933 Patented Aug. 26, 1941 UNITED' STATES PATENT OFFICE william P. DlIrLyTnlie, Enna, N. Y.

Griginal application November 3, 1933, Serial No. 696,475. Divided and this application February 18, 1938, Serial No. 191,241

4 claims. (ci. 21o-166) My invention relates to lters of a typecomprising a filtering medium through which the liquid to be cleaned is passed under pressure, the arrangement being such that a body of air is compressed within the filter during its operation adapted at the end of the filtering operation to cause a backward flow of a substantial amount of the liquid through the ltering medium in the reverse direction so as to clean the face of the filtering medium. It is one of the objects of my invention to provide an improved form and arrangement of parts by which such results can be attained, -by which theA action is made effectively automatic, and in which. there shall be no danger under ordinary circumstances that the dirt cleared from the face of the ltering medium shall find its way to the supply of ting I4 provided with a lvalve I5 by a suitable rotation of which an opening is effected for draining the contents of the receptacle.

My improved receptacle is divided into an inlet chamberrIG and an outlet chamber l1 by means of a yfilter member I8 held in position by shields I9 and 20 above and below the filtering medium,

'such shields .being formed of rectiulated metal,

supporting members 2l and 22 formed of wire mesh being provided between the filtering medium and the shields I9 and 20 respectively.

At the vupper end of the filter, I have provided a valve casing 23 which is provided with nipples oil or other liquid delivered'from the filter at the next subsequent period of operation.

It is one of the objects of my invention to provide in a filter of this type an improved arrangement of housing means and communicating valve parts for controlling the movements of the liquid to be cleaned through thefiltering me dium. In this connection, it is one ofthe objects of my invention to provide an improved arrangement by reason of which the assembly of the parts shall be facilitated while at the same time the structure is kept such as to be effectlvefor its filtering purpose. ,l l It is another object of my invention to improve devices of this type in sundry details hereinafter pointed out. 'I'he preferred means by which I have accomplished my several vobjects are illustrated in the accompanying drawing and are hereinafter specifically described. That which I believe to be new and desire to cover by Letters Patent is set forth in the claims.

'I'his application is being filed as a division of my co-pending application, Ser. No. 696,475, filed Nov. 3, 1933.

In the drawing- Fig. 1 is a central vertical sectional view 'through my improved filter andy bolts I2, a suitable gasket Il being interposedy between said casing members. In the arrangement shown, the lower end of the lower casing 24 and- 25 'extending upwardly through the top wall of the casing member I0,4 being secured in position by means of suitable nuts mounted by means of screw-threads on said nipples. On its bottom face, the valve casing 23 is provided with a nipple 26 which extends downwardlyv through the filtering medium member I8 and the shields I9 and 20 and through the top wall of -a housing 21 which is open at its lower end into the inlet chamber I8, the housing 21 and the filter supporting yparts being held rigidly in position with respect to the nipple 26 by means of nuts mounted by means of screw-threads thereon. In the arrangement shown, the housing 2l comprises a downwardly flared member 21a. and a downwardly tapered member 2lb connected together at their adjacent edges, being of such size as to hold a' substantial quantity of oil or other liquid about the opening in the lower end of the n ipple 26.

An opening 28 is also provided in the bottom wall of the housing 23 adjacent to the opening through the nipple 26. Within the housing 23, I have provided a slide valve 29 in the form of a piston and having a circumferential groove 30 in its outer wall. As is clearly shown in dotted lines, thevalve 29 is provided with a longitudinal opening 3| .through the greater part of its length, being Open at the left in the drawing so as to communicate with the nipple '24, an opening 32 being provided' through the wall of the piston leading into the groove 30. A coiled spring 33 serves normally to hold the slide valve at the limit of its movement-toward the right in the drawing at the end of the cylindrical housing 23 as shown'in Fig. 1.

When the parts are in the position as shown in said Fig. '1, the opening through the nipple 26 from the inletr chamber I6 communicates through the groove 30, the openingy 32 and the longitudinal opening 3l with the nipple 24 so as member II is closed by means comprising a fitto provide for the escape of liquid directly from the inlet chamber. I4 through said nipple 24 so as topassintheusualmannertothebearingsto be lubricated. In this position of the parts, :the

valve 20 shuts of! communication between the which the illter is mounted, the valve 29 is moved by such pressure toward the left into the position as shown in Fig. 2 against the action of the spring 33 so as to provide access between the nipple 2l and the nipple'26. 'I'he oil coming downwardly through the nipple 2l is accordingly delivered downwardly through .the nipple 24, is forced downwardly about the lower edge of the housing 21, and thence upwardly to and through the filtering medium I8 into the outlet chamber I1, from which the oil escapes through the opening 2l, the groove III, the opening 32, the longitudinal opening Il of the valve, and the nipple 24, as shown in Fig. 2. By reason of the resistance to the flow of the oil outwardly through the outlet nipple 24, the air trapped in the upper end portion of the receptacle is substantially compressed, such pressure condition continuing throughout the operation of the oil pump of the automobile. When the delivery of oil `through the nipple 25 is terminated, as when the motor of the automobile stops operating, the valve 29 returns to the position as shown in Fig. 1 and the pressure in the upper end of the receptacle causes a substantial amount of oil to be forced downwardly through` the filtering medium I8 from the outlet chamber to the inlet chamber so as to force a quantity of oil upwardly through the nipple 26, through the valve and through the outlet nipple 24. The relief of the pressure condition through the outlet nipple 24 under such conditions may not be exceedingly rapid, but I have found in practice that when a construction such as is shown in the drawing is used on an automobile for filtering the crank-case' oil, with the nipple 24 connected with the bearings of the automobile, a suillcient now of oil backwardly through the illtering medium is established for eilectively cleaning the inlet chamber face oi the illtering medium, the dirt and grit from the face of the filtering medium being caused to pass vdownwardly into the lower end portion of the inlet chamber I6. Inasmuch as the dirt and grit from the face of the filtering medium are forced to pass outwardly about the housing 21, such dirt and grit are prevented from rising with the slow-moving oil for escape through the nipple 26 and into the bearings.

By my improved construction, I have provided the receptacle into inlet and outlet chambers arranged in such relation that the grit and dirt from the iiltering medium when released by an operation of cleaning the illtering medium are adapted to settle into the lower portion of the inlet chamber, an outlet port communicating with the outlet chamber adapted to permit liquid to escape therethrough under pressure, means for delivering liquid to be filtered into said inlet chamber under such pressure as to compress a quantity of air trapped in the receptacle and to cause liquid to escape from the outlet chamber through said outlet port, and valve means con- Atrolled by the pressure of the liquid entering the receptacle for controlling the movements of the liquid into and through the receptacle, comprising a cylinder communicating at one end with said means for delivering liquid to the receptacle, means connecting said cylinder at a point adjacent to said one end with said inlet chamber, means connecting the opposite end lportion of said cylinder with said outlet port, a port at the intermediate portion of the cylinder opening into said outlet chamber, a valve slidably mounted in said cylinder having a longitudinally extending opening therein, and yielding means adapted normally to hold said piston at the end of said cylinder adjacent to the connection with said inlet chamber in position to close said intermediate port with said two end connections in effective communication with each other through s aid longitudinal4 opening, the arrangement being such that when liquid is being delivered under pressure into the receptacle said valve is held at the opposite end of said cylinder so as to permit said liquid to pass through said cylinder to the inlet chamber and so as to permit liquid to pass through said longitudinal opening from said outlet chamber to said outlet port.

2. In a filter, the combination of a receptacle, means comprising a filtering vmedium for dividing the receptacle into inlet and outlet chambers arranged in such relation that the grit and dirt from the filtering medium when releasedby an operation of cleaning the filtering medium are adapted to settle into the lower portion of the inlet chamber, an outlet port communicating with'the outlet chamber adapted to permit liquid to escape therethrough under pressure, means a illter which is highly eective and which re- 'mains highly effective through a long period of such use as is had ordinarily on an automobile which is started and stopped many times during a day's run, Every time the motor is stopped a partial cleaning of the illtering medium is eifected by the reverse flow of the oil, and the illtering medium is thus kept in condition for effective functioning. E While I prefer to employ the form of mechanism as shown in my drawing, it is to be understood that my `invention is not to be limited to such form except-so far as the claims may be so limited, it being understood that changes might well be made in the form and arrangement of the parts without departing from my invention.

1. In a filter, the combination of a receptacle, means comprising a iiltering medium for dividing for delivering liquid to be filtered into said inlet chamber under such pressure as to compress a quantity of air trapped in the receptacle and to cause liquid to escape from the outlet chamber through said outlet port, and valve means controlled by the pressure of the liquid entering the receptacle for controlling the movements of the liquid into and through the receptacle, comprisinga cylinder communicating at one end with said means for delivering liquid to the receptacle, means connecting said cylinder at a point adjacent to said one end with said inlet chamber, means connecting the opposite end portion ofsaid cylinder with said outlet port, a port at the intermediate portion of the cylinder opening into said outlet chamber, a valve in the form of a sure into the receptacle said liquid passes to theinlet chamber and that under such circumstances the outlet chamber opens through said longitudinal opening in the valve to said outlet port,

3. In a illter, the combination of a receptacle comprising two casing members, a iiltering medium having its edge portions interposed between said casing members, means for securing said two casing members together and serving to hold said illtering medium in position so as to provide an inlet chamber and an outlet chamber, a valve housing in the outlet chamber portion of said receptacle having inlet and outletv nipples projecting therefrom and secured in openings through the wall of the outlet chamber casing at opposite ends of the housing and having a third nipple extending from the housing and through said ltering medium so as to open in said inlet chamber, said valve housing having also an opening into said outlet chamber, and a valve in said housing held normally at the iiuid entrance end of the housing by a spring and held by the fluid against .the action 'of the spring at .the opposite end portion of the housing when liquid is being delivered under pressure to the housing, said valve having a longitudinally extending opening therein through which in one position of the valve said outlet chamber is connected with said outlet port and .through which in the other position of the valve said inlet chamber is connected with said outlet port.

4. In a filter, the combination oi' a housing, means comprising a illtering medium dividing the receptacle into inlet and outlet chambers arranged in such relation that the grit and-dirt from the filtering medium when released by an operation of cleaning the ltering medium are adapted to settle into the lower part of the inlet chamber, a valve housing in the outlet chamber portion of said receptacle, means providing inlet and outlet connections with said housing at opchamber for causing the dirt and grit released from the ltering medium to scatter outwardly -away from said opening as it moves downwardly in said inlet chamber, a valve in said valve housing, a spring in said valve housing normally holding the valve at the fluid entrance end of said housing when no fluid is being ied to the housing and adapted to yieldfor movement of the valve by the fluid to the opposite end of the housing when fluid is being delivered under pressure to the housing, said valve having a longitudinally extending opening therein `through which in one position of the valve said outlet chamber is connected with said outlet P0112n Ali'nd through which in the other position of the valve said inlet chamber is afforded a free open connection with said outlet port.

WILLIAM P. DALRYMPLE. 

